|Publication number||US7726598 B2|
|Application number||US 10/586,590|
|Publication date||Jun 1, 2010|
|Filing date||Jan 20, 2005|
|Priority date||Jan 21, 2004|
|Also published as||EP1706342A1, EP1706342B1, US20080230646, WO2005070797A1|
|Publication number||10586590, 586590, PCT/2005/28, PCT/IT/2005/000028, PCT/IT/2005/00028, PCT/IT/5/000028, PCT/IT/5/00028, PCT/IT2005/000028, PCT/IT2005/00028, PCT/IT2005000028, PCT/IT200500028, PCT/IT5/000028, PCT/IT5/00028, PCT/IT5000028, PCT/IT500028, US 7726598 B2, US 7726598B2, US-B2-7726598, US7726598 B2, US7726598B2|
|Inventors||Alessandro Morelli, Mauro Gelli|
|Original Assignee||Fabio Perini S.P.A.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (12), Classifications (10), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to an unwinding device, to unwind reels of web material to be fed to a production line. Typically, the invention in particular relates to an unwinding device for unwinding reels of tissue paper, of the type commonly used to produce rolls of toilet paper, kitchen towels and the like. Specifically, although not exclusively, the invention relates to an unwinding device particularly suitable to unwind reels of a relatively small axial length, to feed machines for the production of paper napkins.
The invention also relates to a method to unwind reels of web material, in particular reels of tissue paper.
Unwinding devices to unwind reels of web material are known, comprising: a rotating element with supports for at least two reels; and a splicing member to join a first web material coming from an expiring reel to the initial free end of a second web material wound on a new reel. A device of this type is, for example, known from U.S. Pat. No. 1,967,056.
Usually, unwinders of this type are employed to unwind reels of plastic film. The new reel is made to rotate at a peripheral speed equal to the feed speed of the first web material, coming from the expiring reel. This feed speed may have been reduced to carry out splicing of the old and the new web material. The head of the second web material, wound on the second reel, is fixed thereto by an adhesive tape, so that it remains adherent to the reel during the acceleration phase thereof. This phase is also known as “launch” phase.
When splicing of the two web materials is carried out, the adhesive tape used to hold the head end of the new web material is simply detached through the effect of the traction exerted on the web material. The plastic film forming the web material is sufficiently strong to prevent drawbacks.
This operating mode is not compatible with web material with limited tensile strength, such as tissue paper, due to the fact that at the time of splicing of the two web materials, the adhesive tape used to fasten the initial free end of the new reel would cause the material to tear and therefore arrest of the entire production line.
The object of the present invention is to produce an unwinding device of the type described above which is suitable to handle web materials even with limited tensile strength, such as—and typically (although not exclusively)—tissue paper.
Essentially, in the unwinding device according to the invention a mechanical member is associated with each of the reel supports provided on the device, to retain the initial free end of the reel disposed on said support. The head end or initial free end is thereby held mechanically until splicing, without the need to employ adhesive tape.
According to a particularly advantageous embodiment of the invention, the mechanical member is torsionally connectable to the respective support and releasable therefrom, to rotate with the reel or to remain in a deactivated condition while the reel rotates. In this way, the support is carried in rotation to angularly accelerate the reel to the desired peripheral speed, also drawing the mechanical retaining member of the initial free end of the web material in rotation together with the reel. Therefore, the web material on the expiring reel and the initial free end of the new reel are spliced and at a suitable instant (subsequent or simultaneous to splicing) the mechanical member is torsionally released from the support, so that it is in a neutral position in which it does not interfere with unwinding of the new reel.
For example, the mechanical member can comprise an arm, extending radially from the respective support, and a roller carried by the free end of the arm, said roller having an axis parallel to the axis of the reel. The arm can have an adjustable length, to adapt to variable diameters of the reels to be handled. The roller can be connected rigidly to the arm, but preferably is supported idle thereon.
According to a different aspect, the invention relates to a method to continuously feed a web material wound on a reel to a processing machine, comprising the steps of:
Characteristically, according to the invention: the initial free end of the second web material is held adherent to the second reel, until splicing of the first and of the second web material, by means of a mechanical member which rotates with said second reel; and said mechanical member is carried to an idle position after said splicing.
According to an advantageous embodiment of the method of the present invention a strip of double-sided adhesive can be applied to the external surface of the second reel in a rearwards position, in the direction of rotation of the reel, with respect to the position in which said mechanical member holds the initial free end. This strip of double-sided adhesive is used to join together the two web materials.
Further advantageous characteristics and embodiments of the device and of the method according to the invention are indicated in the appended dependent claims.
The invention shall now be better understood by following the description and accompanying drawing, which shows a non-limiting practical embodiment of the invention. In the drawing, where the same numbers indicate the same or equivalent parts:
With initial reference to
Each support 13, 15 is motorized and carries means, known and not shown, to torsionally block a respective reel of web material, in order to draw it in rotation. In fact, in this case the device has a central drive system, that is, the reels are carried in rotation by a rotating central support. However, it would also be possible for them to be carried in rotation by a peripheral unwinding system, for example composed of belts in contact with the cylindrical surface of said reels.
Supported on each support 13, 15 and torsionally connectable thereto is a mechanical member, indicated generically with 21 (
The distal end of the arm 23 carries an idle roller 25, extending parallel to the axis of the respective support 13 or 15. As can be seen in the schematic representation in
Besides the rotating element 3, the bearing structure 1 supports an oscillating arm 31 which carries a pressure roller 33, with axis parallel to the oscillation axis of the arm 31 and to the rotation axis of the element 3. A blade, indicated with 35, advantageously although not necessarily toothed, is associated with the pressure roller 33. Moreover, a series of ply-bonding wheels 37, cooperating with one or other of the return rollers 17 or 19, is also carried on the structure 1.
The device described above operates in the way set forth hereunder with reference to
When the first reel B1 of web material N1 is about to expire and is to be replaced with the second reel B2, on which a web material N2 is wound, said second reel is carried in rotation with a gradual angular acceleration by means of the respective support 15. Simultaneously, the reel B1 can be slowed down if necessary to carry out exchange of one reel with the other at reduced speed with respect to the normal operating speed. The peripheral speed of the reels B1 and B2 can be detected by respective encoder, in contact with the edge of the reels. For this purpose—as mentioned above—the length of the rollers 25 of the two mechanical members 21 is such that an edge of the reels is left free.
During the angular acceleration phase of the reel B2, the mechanical retaining member 21 remains torsionally connected to the support 15 so that it rotates with the reel. The rotating element 3 is in the position in which the support 15 which carries the new reel B2 of web material N2 is located downstream, with respect to the direction of feed of the material N1, and therefore approximately under the pressure roller 33 and the cutting blade 35.
When the peripheral speed of the reel B2 reaches the feed speed of the web material N1 from the reel B1, automatic splicing of the two web materials N1, N2 can take place. In
In actual fact, especially when the diameter of the roller 25 is very small, the pressure roller 33 can also come into contact with the reel and press thereon in a position upstream of the roller 25, which can be <<by-passed>> by the pressure roller 33 during rotation of the reel.
When the strip of double-sided adhesive tape BA passes under the pressure roller 33, the pressure exerted by the roller 33 causes reciprocal adhesion of the two web materials N1 and N2. The cutting blade 35 subsequently cuts the tail of the web material N1, allowing feed of the web material N2 to continue, while the reel B1 is removed.
Before splicing of the two plies by means of the strip of double-sided adhesive tape BA, the roller 25 remains fixed on the reel B2, as the entire mechanical member 21 rotates integral therewith. The pressure roller 33, which presses on the external surface of the reel B2, can easily by-pass the roller 25 thanks to the small diameter of the latter.
Once splicing has taken place, the mechanical member 21 associated with the support 15 of the reel B2 is torsionally released from the support 15 and is positioned vertically, hanging downwards from said support, as shown in
The reel B2 is replaced with a new reel B3 (
The ply-bonding wheels 37 can be utilized in particular when the web materials N1, N2, N3 are composed of two or more plies. In this case the reels are activated to join the plies of expiring web material together stably, before splicing to the new web material. In fact, they act on one or other of the return rollers 17, 19, immediately upstream of the splicing area with the web material of the new reel standing by. The plies forming the new web material are prepared by the operator so that they are joined together in the initial or head portion of the web material. In this way the strip of double-sided adhesive tape BA joins together the outermost ply of the new reel with the innermost ply of the expiring reel. Ply-bonding of the material coming from the expiring reel and suitable preparation of the head portion of the material coming from the second reel ensure that the other plies are also joined.
It would also be possible to arrange the ply-bonding system in another position along the path of the web materials, or to use another splicing system, for example a glue that seeps through. In any case, notwithstanding the splicing system, the portion of web material containing the joining area of the materials coming from the two reels is advantageously discarded. The part to be discarded can be easily identified, for example with marking by means of an inkjet, which may even be a UV ink, visible only in ultraviolet light.
In this configuration, the mechanical retaining member of the initial free or head end T of each reel B1, B2 again has an arm 23 which, however, unlike the previous example, is not torsionally connected directly to the support 13 or 15 of the respective reel, but is supported idle thereon. The arm 23 again carries a roller 25 or other retaining element of the head end T. The roller 25 is integral with a slide 81 sliding at the end of the arm 23, to advance towards and withdraw from the cylindrical surface of the reel B1 or B2. In the layout in
This position with the roller 25 closest to the reel B1 or B2 is guaranteed by a blocking system of a suitable type, for example even simply by friction between the slide 81 and the arm 23.
When the device carries out splicing of the two web materials, having taking the full reel in the stand-by position at a peripheral speed essentially the same as the feed speed of the web material fed from the working reel, according to the description above with reference to the previous figures, the free end T is released from the reel. For this purpose a mechanism is provided to cause the slide 81 carrying the roller 25 to withdraw in a radial direction, along the arm 23. In the example shown, this mechanism has a cam profile or one with an inclined plane 83, integral with the slide 81. This cam profile 83 can cooperate with a wheel 85 carried by a rod 87 controlled by an actuator 89 integral with the side panel 1 of the device. During the angular acceleration phase of the reel B1 or B2, before splicing of the two plies the wheel 85 is in the withdrawn position shown with the solid line in
The hook 91 is provided with an extension 91B destined to cooperate with a wheel indicated again with 85 and having the same functions as the wheel 85 of the previous embodiment.
The elastic member 25 fixed with the two ends to the disks 23A and 23B holds the end T during the angular acceleration phase of the reel B1 or B2 until splicing to the web material of the other reel.
At the moment of splicing of the web material fed from the working reel to the web material wound on the reel, the free end T of which is connected by the elastic member 25, the wheel 85 is extracted from the withdrawn position shown with the solid line in
The above describes an unwinding system in which the reels are carried in rotation by a central system, that is, by a motorized axial support. However, it would also be possible for rotation of the reels to be obtained by means of a peripheral system, for example by means of motorized belts that act on the external surface of the reel. It would also be possible to use combined systems, which apply a driving torque by means of a central axis and by means of a peripheral flexible member.
The release systems of the retaining member can also differ from those described. For example, it would be possible to use a system comprising an actuator rotating together with the arm or with the disk supporting the retaining element and which when commanded causes release thereof. When the system comprises an elastic retaining element, as in the last example described, the hook holding the connectable end can be released by an electromagnet or other actuator. Power and actuation commands are provided by a suitable rotating distributor.
It is understood that the drawing purely shows a non-limiting practical embodiment of the invention, which may vary in forms and arrangements without however departing from the scope of protection of the invention. Any reference numerals in the appended claims are provided for the sole purpose of facilitating reading in the light of the description hereinbefore and the attached drawings and do not in any manner limit the scope of protection.
|Cited Patent||Filing date||Publication date||Applicant||Title|
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|US6764040 *||Apr 12, 2002||Jul 20, 2004||Komori Corporation||Method for controlling a device for continuously supplying web and device therefor|
|U.S. Classification||242/555.5, 242/559.2|
|Cooperative Classification||B65H19/1821, B65H2301/4621, B65H2301/4632, B65H2301/46312, B65H19/1868|
|European Classification||B65H19/18B2B, B65H19/18F4|
|Feb 18, 2010||AS||Assignment|
Owner name: FABIO PERINI S.P.A.,ITALY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MORELLI, ALESSANDRO;GELLI, MAURO;REEL/FRAME:023954/0959
Effective date: 20060718
|Jan 25, 2011||CC||Certificate of correction|
|Dec 2, 2013||FPAY||Fee payment|
Year of fee payment: 4